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NORTH AMERICAN FivORA [Volume 7 



spherical or occasionally ovoid or slightly angled, minutely but abundantly verruculose, 

 9-14 fi in length. 



On Poaceae : 



Sorghum vulgare, Illinois, Iowa, Kansas, Minnesota, Mississippi, Nebraska, New Jersey, 



Ohio, Texas. 

 Zea Mays, Kansas, Ohio. 

 Type locality : Egypt, on Sorghum vulgare. 



Distribution : New Jersey to Minnesota and Texas ; also in South America, Europe, Asia and 

 Africa. 



Illustrations: Trans. Acad. Sci. St. Ivouis 7 : pi. 25, f. 14-18; Bull. 111. Agr. Exp. Sta. 57: 

 pi. O, R5; Bull. Kan. Agr. Exp. Sta. 62 : pi. 4, 6, 8-10; Brefeld, Unters. Gesammt. Myk. 5 : pL 

 11^ f, 3-7 ; Ohio S. U. Nat. l'.pi.2 ; Bull. Kan. Agr. Exp. Sta. 23 : pL 3^. 



ExsiCCATi : Seym. & Earle, Econ. Fungi 5^7, C 45 ; Ellis & Ev. N. Am. V}xn%\3564. 



16. Sphacelotheca Hydropiperis (Schum.) DeBary, Verg. 



Morph. Biol. Pike 187. 1884. 



Uredo Hydropiperis Schum. Enum. PI. Saell. 2 : 234. 1803. 

 UsHlago Candolld Tvil. Ann. Sci. Nat. III. 7: 93. 1847. 

 Ustilago Hydropiperis Schrot. Beitr. Biol. Pfl. 2 : 355. 1877. 



Sori in ovaries, forming oblong or ovate bodies about 3-5 mm. in length, protected by 

 floral envelopes at base, with false membrane dehiscing at apex, revealing purple-black 

 spore-mass and ijiore or less evident columella ; sterile cells besides forming membrane also 

 constituting part of the columella, spore-like (often probably immature spores) , hyaline or 

 occasionally violet- tin ted, easily separatiiig into individual cells, chiefly subspherical, 6-17 ^ ; 

 spores pxirplish, broadly oblong or ovate but chiefly subspherical, minutely but abundantly 

 verruculose, mostly 10-17 ii in length. 



On Polygonaceae : 



Persicaria Hydropiper {Polygonurn Hydropiper) , Nebraska, Rhode Island. 



1 Persicaria Persicaria {Polygonum Persicaria'), New York. 



Persicaria punctata {Polygonum^ punctatum., P. acre), Connecticut, Delaware, Illinois, 



Massachusetts. 

 Persicaria {Polygonum) sp. , Missouri. 



Tracaulon sagiUatum, {Polygonum sagittatum.) , Connecticut, Delaware, Illinois, Iowa, 

 Maine, Massachusetts, Nebraska, New York, North Carolina, "Vermont, West Virginia. 

 Type locality : Europe, on Polygonum Hydropiper {Persicaria Hydropiper). 

 Distribution : New England to North Carolina and Nebraska ; also in South America, Europe, 

 Asia and Australia. 



Illustrations : Ann. Sci, Nat. III. 7 : pL3,f. 20, 21; Bull. Conn. Geol. Nat. Hist. Surv. 5 : 

 f.6,37; Brefeld, Unters. Gesammt. Myk. 12: pl.8,f. 16-25; Bull. Soc. Nat. Mosc. 40i : pl.3,f. 

 6; DeBary, Verg. Morph. Biol. Vi\z&f.SO. 



ExsicCATi : Seym. & Earle, Econ. Fungi C41, C 42, C 43 ; Shear, N. Y. Fungi 85 ; Ellis & 

 Ev. N. Am. Fungi 289, 2261; Thiim. Myc. Univ. 1018 ; Ellis & Ev. Fungi Columb. JJtf, 5^J. 



Sphacelotheca Hydropiperis borealis Clinton, Proc. Bost. Soc. Nat. Hist. 31 : 395. 1904. Sorus 

 very similar to that of the species with perhaps the false membrane not so prominent and with the 

 columella more robust ; sterile c-ells hyaline or slightly tinted, subspherical, thick-walled, chiefly 

 slightly larger than the spores ; spores violet-purple, ovoid to spherical or occasionally more 

 irregular, often apparently smooth but really minutely granular, chiefly 8-11 m in length. On 

 Polygonaceae : Bistoria bistortoides {Polygonum bistortoides) , Washington, Wyoming. 



3. MELANOPSICHIUM G. Beck, Ann. Nat. Hofmus. Wien 9: 122. 1894. 



Sori on various parts of the host, forming dark-colored, hard, firmly agglutinated and 

 conspicuous spore-masses ; spores single, developed in irregular chambers or groups arising 

 from a mixture of plant tissue and fungous threads, thus giving a tubercular character to 

 the sorus, enveloped by a more or less permanent gelatinous envelope, discharging from 

 spore-mass by absorption of water, of medium size; germination as in Ustilago. 



Type, Ustilago austro-americana Speg. 



1. Melanopsichium austro-americanum (Speg.) G. Beck, Ann. Nat. 



Hofmus. Wien 9 : 122. 1894. 



Ustilago austro-americana Speg. Anal. Soc. Ci. Argent. 12 : 63. 1881. 



Sori chiefly in the inflorescence, forming more or less irregularly lobed masses arising 

 from the fusion of the infected parts, less commonly on the leaves and then smaller, 

 usually prominent, 2 or 3 mm. to 2 cm. in length, internally somewhat nodular or tuber- 

 cular, forming a. hard, firmly agglutinated, black spore-mass mixed vnth plant tissues ; 

 spores oblong to chiefiy subspherical, often somewhat irregular, with more or less evident 



